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    (k-1)/(k+1+k^2)=0.207423356862745098
    x2 + 11.66x -6.69=0
    y^2-64y+49
    70-x=ln(70/x)
    (1+k^2)×(9.9/5.1)^2=1-k
    (1+k^2)×(51.1/5.1)^2=(k-1)^2
    (9.9/5.1)×(1+k^2)=(1-k)^2
    (X+20.16)/(X+20.16+21432)=0.15
    (1+k^2-2k)×(9.9/5.1)^2=(1-k)^2
    x^2+1=3
    -78+80.4/(1+X/12*2)+3.6/(1+X/12*24)=0
    -78+84/(1+X/12*2)=0
    30x+50(100-x)=3500
    x=((1+20%)-(1-20%))÷(1-20%)
    x^2+5x-2250
    x+4=0
    【16*(2^1/2)-7】x^2+【24*(2^1/2)-7】x+9*(2^1/2)=0
    (4x+30)/2-2=(45-100x)/30
    3x^2+24x+20=0
    84/(1+X/12*2)=78

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